KerasHub: Multi-framework Models

[!IMPORTANT] 📢 KerasNLP is now KerasHub! 📢 Read the announcement.

KerasHub is a library that supports natural language processing, computer vision, audio, and multimodal backbones and task models, working natively with TensorFlow, JAX, or PyTorch. KerasHub provides a repository of pre-trained models and a collection of lower-level building blocks for these tasks. Built on Keras 3, models can be trained and serialized in any framework and re-used in another without costly migrations.

This library is an extension of the core Keras API; all high-level modules are Layers and Models that receive that same level of polish as core Keras. If you are familiar with Keras, congratulations! You already understand most of KerasHub.

All models support JAX, TensorFlow, and PyTorch from a single model definition and can be fine-tuned on GPUs and TPUs out of the box. Models can be trained on individual accelerators with built-in PEFT techniques, or fine-tuned at scale with model and data parallel training. See our Getting Started guide to start learning our API. Browse our models on Kaggle. We welcome contributions.

Quick Links

For everyone

• Home Page
• Developer Guides
• API Reference
• Pre-trained Models

For contributors

• Contributing Guide
• Roadmap
• Style Guide
• API Design Guide
• Call for Contributions

Quickstart

Fine-tune a BERT classifier on IMDb movie reviews:

import os
os.environ["KERAS_BACKEND"] = "jax"  # Or "tensorflow" or "torch"!

import keras_hub
import tensorflow_datasets as tfds

imdb_train, imdb_test = tfds.load(
    "imdb_reviews",
    split=["train", "test"],
    as_supervised=True,
    batch_size=16,
)

# Load a BERT model.
classifier = keras_hub.models.Classifier.from_preset(
    "bert_base_en",
    num_classes=2,
    activation="softmax",
)

# Fine-tune on IMDb movie reviews.
classifier.fit(imdb_train, validation_data=imdb_test)
# Predict two new examples.
classifier.predict(["What an amazing movie!", "A total waste of my time."])

Try it out in a colab. For more in depth guides and examples, visit keras.io/keras_hub.

Installation

To try out the latest version of KerasHub, you can use our nightly package:

pip install keras-hub

KerasHub currently requires TensorFlow to be installed for use of the tf.data API for preprocessing. Even when pre-processing with tf.data, training can still happen on any backend.

Read Getting started with Keras for more information on installing Keras 3 and compatibility with different frameworks.

[!IMPORTANT] We recommend using KerasHub with TensorFlow 2.16 or later, as TF 2.16 packages Keras 3 by default.

Configuring your backend

If you have Keras 3 installed in your environment (see installation above), you can use KerasHub with any of JAX, TensorFlow and PyTorch. To do so, set the KERAS_BACKEND environment variable. For example:

export KERAS_BACKEND=jax

Or in Colab, with:

import os
os.environ["KERAS_BACKEND"] = "jax"

import keras_hub

[!IMPORTANT] Make sure to set the KERAS_BACKEND before importing any Keras libraries; it will be used to set up Keras when it is first imported.

Compatibility

We follow Semantic Versioning, and plan to provide backwards compatibility guarantees both for code and saved models built with our components. While we continue with pre-release 0.y.z development, we may break compatibility at any time and APIs should not be considered stable.

Disclaimer

KerasHub provides access to pre-trained models via the keras_hub.models API. These pre-trained models are provided on an "as is" basis, without warranties or conditions of any kind. The following underlying models are provided by third parties, and subject to separate licenses: BART, BLOOM, DeBERTa, DistilBERT, GPT-2, Llama, Mistral, OPT, RoBERTa, Whisper, and XLM-RoBERTa.

Citing KerasHub

If KerasHub helps your research, we appreciate your citations. Here is the BibTeX entry:

@misc{kerashub2024,
  title={KerasHub},
  author={Watson, Matthew, and  Chollet, Fran\c{c}ois and Sreepathihalli,
  Divyashree, and Saadat, Samaneh and Sampath, Ramesh, and Rasskin, Gabriel and
  and Zhu, Scott and Singh, Varun and Wood, Luke and Tan, Zhenyu and Stenbit,
  Ian and Qian, Chen, and Bischof, Jonathan and others},
  year={2024},
  howpublished={\url{https://github.com/keras-team/keras-hub}},
}

Acknowledgements

Thank you to all of our wonderful contributors!